Thanks to a new interview with Ringo Starr and Paul McCartney – conducted by David Letterman – Sunday night’s The Night That Changed America: A GRAMMY Salute To The Beatles – has gone from being a two hour special to two and a half hours.

In the preview clip below, Letterman isn’t doing his usual interview from behind his desk; instead, he, McCartney and Starr are walking around the Ed Sullivan Theater – the home of Late Show With David Letterman and the place where the Beatles made their big U.S. debut on The Ed Sullivan Show back in 1964 – and Ringo notes that it doesn’t look as big as it did back then. Letterman notes that there was, in fact, an extra balcony there in 1964 that isn’t there anymore, and McCartney says, “It’s like going back to your old school, isn’t it? It’s little now, but you thought it was huge!”

The Night That Changed America: A GRAMMY Salute To The Beatles airs on CBS Sunday night at 8 p.m. ET. Read our review of the live performances from the show (which were filmed the night after the GRAMMYs) here. Check out our interview with the show’s musical director, Don Was, here.

And for a a pre-show, tune in to the online event, 50 Years Later THE BEATLES Sunday at 6:30pm ET/3:30pm PT. The live symposium, hosted by CBS News’ Anthony Mason, will highlight rare footage from CBS News’ archives of the Beatles’ first three days in New York City and their famous appearance on The Ed Sullivan Show on February 9, 1964. The event will feature former Rolling Stones manager and Beatles publicity assistant Andrew Loog Oldham, Mick Jones of Foreigner, photographer (and George Harrison’s ex-wife) Pattie Boyd, and Julie Taymor, director of the feature film based on Beatles songs, Across The Universe. Watch the live stream of that event here.